Cloudflare Free Dynamic DNS (DDNS) Resolution

Aug 4, 2023#CloudFlare #DDNS217

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This is a guide on how to use a script to update a domain name with a dynamic IP address using Cloudflare's API. It provides instructions on obtaining the necessary API key, setting up the domain name for DDNS, running the script, and configuring a cron job for automatic updates.

Script Address#

yulewang/cloudflare-api-v4-ddns

Cloudflare API v4 Dynamic DNS Update in Bash

Shell332243

Get KEY#

Visit https://dash.cloudflare.com/profile and find the Global API Key at the bottom of the page. Click on View on the right to view the Key and save it. Find the Global API Key at the bottom of the page, click on View on the right to view the Key and save it.

Parse Domain Name#

Set up a second-level domain name for DDNS resolution, and the traffic does not pass through CDN (cloud turns gray).

Add an A record, for example: hkt.test.com, set Proxy status to DNS only.

The IPv4 address can be arbitrary.

Run the Script#

Download the DNNS script

curl https://raw.githubusercontent.com/aipeach/cloudflare-api-v4-ddns/master/cf-v4-ddns.sh > /root/cf-v4-ddns.sh && chmod +x /root/cf-v4-ddns.sh

Configuration Information#

Modify the DDNS script and provide the relevant information

vi cf-v4-ddns.sh

# incorrect api-key results in E_UNAUTH error
# Fill in the Global API Key
CFKEY=

# Username, eg: user@example.com
# Fill in the CloudFlare login email
CFUSER=

# Zone name, eg: example.com
# Fill in the top-level domain name to be used for DDNS
CFZONE_NAME=

# Hostname to update, eg: homeserver.example.com
# Fill in the second-level domain name for DDNS (only need to fill in the prefix)
CFRECORD_NAME=

When running the script for the first time, the output will display the current IP. Go to Cloudflare to check and make sure the IP has been changed to the current IP.

./cf-v4-ddns.sh

Set up a Scheduled Task#

crontab -e
*/2 * * * * /root/cf-v4-ddns.sh >/dev/null 2>&1

# If you need a log, replace the code above
*/2 * * * * /root/cf-v4-ddns.sh >> /var/log/cf-ddns.log 2>&1